I saw the book was showing "ita" as the word for "yes". But elsewhere I have read that, strangely:
Latin has no simple words for the unqualified "yes" or "no" that is so common in English.... Saying yes or no takes a little thought in Latin.In Latin, you can't "just say no".
Nor can you "just say yes".
You have to think before you express
that it is, or isn't, so.